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Method for preparing AgTiB2 contact material

A technology of contact material and process control agent, applied in contacts, electrical components, electrical switches, etc., can solve the problems of low density, poor electrical conductivity and arc erosion resistance of Ag-based contact materials, and achieve excellent resistance. Arc erosion performance, effect of increasing density and hardness

Inactive Publication Date: 2012-07-04
XIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of this invention is to provide a kind of AgTiB 2 The preparation method of the contact material overcomes the problems of low density of the Ag-based contact material prepared by the existing method, resulting in poor electrical conductivity and arc erosion resistance

Method used

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  • Method for preparing AgTiB2 contact material
  • Method for preparing AgTiB2 contact material
  • Method for preparing AgTiB2 contact material

Examples

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preparation example Construction

[0025] The invention provides a kind of preparation method of AgTiB2 contact material, such as figure 1 As shown, follow the steps below to implement:

[0026] Step 1, ball milling

[0027] TiB with an average particle size of 1-10 μm and a purity of not less than 99.9% 2 The particles are ball-milled in a high-energy ball mill, the balls are agate balls, the ball-to-material ratio is 20:1-60:1, and anhydrous ethanol is added as a process control agent in the ball mill, and the addition amount is TiB 2 2% to 5% of the total powder mass, control the speed of the ball mill to 150-400rpm, and the ball milling time to 60-120h;

[0028] Step 2, mix powder

[0029] TiB ball-milled in step 1 2 The particles are mixed with Ag powder with an average particle size of 50-100 μm and a purity of not less than 99.99% in a mixer, TiB 2 The particles account for 0.1-10% of the total mass, the sum of the mass percentages of the two components is 100%, and the mixing time is 1-5h;

[0030...

Embodiment 1

[0035] TiB with an average particle size of 1-10 μm and a purity of not less than 99.9% 2 The particles are ball milled in a high-energy ball mill, the balls are agate balls, the ball-to-material ratio is 60:1, and anhydrous ethanol is added as a process control agent in the ball mill, and the addition amount is TiB 2 2% of the total mass of the powder, the speed of the ball mill is controlled to 200rpm, and the ball milling time is 60h; the ball-milled TiB 2 The particles are mixed with Ag powder with an average particle size of 50-100 μm and a purity of not less than 99.99% in a mixer, TiB 2 The particles account for 4% of the total mass, the sum of the mass percentages of the two components is 100%, and the powder mixing time is 4h; the mixed powder is cold-pressed at a pressure of 350MPa, and the holding time is 30s; the compact is controlled by the mold The diameter is 30mm, and the height of the compact is 25mm; the compact is placed in a high-temperature vacuum sinteri...

Embodiment 2

[0037] TiB with an average particle size of 1-10 μm and a purity of not less than 99.9% 2 The particles are ball milled in a high-energy ball mill, the balls are agate balls, the ball-to-material ratio is 20:1, and anhydrous ethanol is added as a process control agent in the ball mill, and the addition amount is TiB 2 4% of the total mass of the powder, the ball mill speed is controlled to be 150rpm, and the ball milling time is 100h; the ball-milled TiB 2 The particles are mixed with Ag powder with an average particle size of 50-100 μm and a purity of not less than 99.99% in a mixer, TiB 2 The particles account for 0.1% of the total mass, the sum of the mass percentages of the two components is 100%, and the mixing time is 1h; the mixed powder is cold-pressed at a pressure of 200MPa, and the holding time is 40s; the compact is controlled by the mold The diameter is 20mm, and the height of the compact is 30mm; the compact is placed in a high-temperature vacuum sintering furna...

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Abstract

The invention discloses a method for preparing a AgTiB2 contact material, which comprises: ball-milling TiB2 powder, and mixing the TiB2 powder and Ag powder, wherein the high-purity Ag powder and TiB2 powder are used as the raw materials; and pressing the mixed powder by a press, sintering the pressed blanks under vacuum, and obtaining the AgTiB2 contact material. Compared with the conventional powder metallurgy technology, the preparation method disclosed by the invention can obviously improve the compactness and hardness of the AgTiB2 contact material, thereby improving arc erosion resistance.

Description

technical field [0001] The invention belongs to the technical field of metal material preparation, in particular to an AgTiB 2 Preparation method of contact material. Background technique [0002] AgTiB 2 Contact materials have high electrical and thermal conductivity and good arc erosion resistance, and have a wide range of application potentials in contact materials. With the continuous improvement of the miniaturization, long life and reliability requirements of switching devices, higher and higher requirements are put forward for the performance of contact materials. At present, the preparation of Ag-based contact materials mainly adopts the traditional powder metallurgy method, and the density of the prepared products is not high, resulting in low electrical conductivity and poor arc erosion resistance. If the strengthening phase and material structure are adjusted, it can not only increase the density, but also disperse the arc, reduce the concentrated erosion of th...

Claims

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Application Information

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IPC IPC(8): C22C1/05C22C5/06C22C32/00H01H1/023H01H11/04
Inventor 王献辉张天明邹军涛梁淑华刘马宝刘启达
Owner XIAN UNIV OF TECH
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